Internet and Web

onreadystatechange is an event handler property of XMLHttpRequest, not a method. You assign a callback function to it, which gets invoked when the readyState changes.

XMLHttpRequest (AJAX) requests do not add entries to the browser's history. Only normal page navigation or history.pushState/replaceState calls modify the history stack.

SharePoint URLs typically follow the format http://Servername:Portnumber/ where the port number is required because SharePoint web applications run on specific ports (like 80, 443, or custom ports). The server name (hostname) precedes the port number in standard URL format. Option C reverses this incorrectly.

Response time is the time elapsed from sending a request to receiving the complete response. In this scenario, the 30-second delay from clicking login to seeing the homepage is the response time. Wait time (Option A) and Transaction Delay (Option B) are not standard performance testing terms. Transaction wait time (Option D) is not a defined metric.

This is false. A web service is more than just a function or method exposed on the web. It is a standardized way of integrating web applications using XML, SOAP, WSDL and UDDI open standards over the internet. It involves a complete architecture with protocols for discovery, description, and communication.

Web services are based on open standards (like HTTP and SOAP) and use text-based message formats (like XML or JSON). These features enable cross-platform interoperability, unlike vendor-specific, binary-based native technologies such as EJB, COM/DCOM, or CORBA.

REST web services operate directly over standard HTTP methods like GET, POST, PUT, and DELETE without requiring an enveloping protocol format such as the XML envelope used by SOAP web services.

RIA stands for Rich Internet Application, which refers to web applications with features and functionality similar to desktop applications.

Web Content Management focuses on template development, site navigation, site publishing, and security/access control for managing web content. Portal services (D) are a separate layer - they aggregate content and applications but are not part of the core WCM functionality.

Site Directory service maintains a catalog of websites and network locations with link scanning capabilities to detect broken links, changed URLs, or missing sites. This is essential for maintaining portal integrity. Site Collections, Navigation, and BDCs are different SharePoint components.

Hyperlinks provide versatile navigation capabilities, allowing users to jump to various destinations including secondary windows within the same application, external applications, search windows, and specific pages in navigation panes.

Clicking the back button loads the previously visited page from the browser's local cache rather than sending a new HTTP request to the server, provided the cache has not expired or headers do not restrict it. This minimizes network traffic and speeds up navigation, making the cached option correct.

Web crawlers (also called spiders or bots) are the core component of search engines that systematically browse the web to index pages. Search engines use crawlers to discover and catalog content, while web optimizers, drillers, and the search engine itself are not fundamental components.

Search Engine Optimization (SEO) is the practice of improving website visibility in organic search results. Techniques include keyword optimization, quality content creation, backlink building, and technical improvements to help search engines better understand and rank the site.

W3C (World Wide Web Consortium) is the international standards organization that develops protocols and guidelines for the web, including HTML, CSS, and XML specifications. ICANN handles domain names, IANA manages IP address allocation, and WWW refers to the web itself.